save project

my_search.py

@@ -7,3 +7,17 @@ num = random.choice(alist)
 # 请完善二分查找函数binary_search(),查找出num在列表alist里面的索引位置
 # 请完善二分查找函数binary_search(),查找出num在列表alist里面的索引位置
 
 
 def binary_search(alist,num):
 def binary_search(alist,num):
+    l=0
+    h=len(alist)-1
+    while l<=h:
+        m=(l+h)//2
+        g=alist[m]
+        if g==num:
+            return m
+        elif g<num:
+            l=m+1
+        else:
+            h=m-1
+
+r=binary_search(alist,56)
+print(r)
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